J/ApJS/252/23 E(V-I) reddening map of MCs from OGLE-IV RC stars (Skowron+, 2021)
OGLE-ing the Magellanic System: optical reddening maps of the Large and Small
Magellanic Clouds from Red Clump stars.
Skowron D.M., Skowron J., Udalski A., Szymanski M.K., Soszynski I.,
Wyrzykowski L., Ulaczyk K., Poleski R., Kozlowski S., Pietrukowicz P.,
Mroz P., Rybicki K., Iwanek P., Wrona M., Gromadzki M.
<Astrophys. J. Suppl. Ser., 252, 23 (2021)>
=2021ApJS..252...23S 2021ApJS..252...23S
ADC_Keywords: Magellanic Clouds; Extinction; Reddening; Colors; Surveys
Keywords: Interstellar dust extinction ; Magellanic Clouds ; Red giant clump
Abstract:
We present the most extensive and detailed reddening maps of the
Magellanic Clouds (MCs) derived from the color properties of Red Clump
(RC) stars. The analysis is based on the deep photometric maps from
the fourth phase of the Optical Gravitational Lensing Experiment
(OGLE-IV), covering approximately 670deg2 of the sky in the
Magellanic System region. The resulting maps provide reddening
information for 180deg2 in the Large Magellanic Cloud (LMC) and
75deg2 in the Small Magellanic Cloud (SMC), with a resolution of
1.7'x1.7' in the central parts of the MCs, decreasing to approximately
27'x27' in the outskirts. The mean reddening is E(V-I)=0.100±0.043mag
in the LMC and E(V-I)=0.047±0.025mag in the SMC. We refine methods
of calculating the RC color to obtain the highest possible accuracy of
reddening maps based on RC stars. Using spectroscopy of red giants, we
find the metallicity gradient in both MCs, which causes a slight
decrease of the intrinsic RC color with distance from the galaxy
center of ∼0.002mag/deg in the LMC and between 0.003 and 0.009mag/deg
in the SMC. The central values of the intrinsic RC color are 0.886 and
0.877mag in the LMC and SMC, respectively.
Description:
The 1.3m telescope of the OGLE survey is located at the Las Campanas
Observatory in Chile and has been observing the southern sky since
1996 on a nightly basis. The fourth phase of the project started in
2010, when a new 32 chip mosaic CCD camera with a 1.4deg2 total field
of view was installed on the telescope. Since then, OGLE-IV has been
observing the Magellanic System in the I and V bands with a cadence of
1-4 days, later reduced to about 10 days in the sparsely populated
regions of the Magellanic Bridge and the outskirts of the Magellanic
Clouds (MCs).
For technical details on the OGLE-IV survey, please refer to
Udalski+ (2015AcA....65....1U 2015AcA....65....1U).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 68 81684 E(V-I) reddening map based on Red Clump (RC) stars
color from the OGLE-IV survey
fig15/* . 2 FITS images of E(V-I), e_E(V-I), E_(V-I),
Median (V-I), Intrinsic (V-I), E(V-I) mode and
box size
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See also:
J/A+AS/121/95 : Giant stars abundances in 24 clusters (Carretta+ 1997)
J/AJ/116/723 : LMC star clusters ages and metallicity (Bica+ 1998)
J/AcA/49/223 : BVI photometry of OGLE LMC Cepheids (Udalski+, 1999)
J/AcA/49/437 : BVI photometry of OGLE SMC Cepheids (Udalski+, 1999)
J/AJ/123/855 : Magellanic Clouds Photometric Survey: the SMC (Zaritsky+, 2002)
J/AJ/128/1606 : Magellanic Clouds Photometric Survey: the LMC (Zaritsky+, 2004)
J/A+A/430/421 : Reddening in LMC bar region (Subramaniam, 2005)
J/AJ/132/1630 : CaII spectroscopy in MC clusters (Grocholski+, 2006)
J/MNRAS/377/300 : CT1 photometry in 6 SMC star clusters (Piatti+, 2007)
J/MNRAS/389/678 : Extended objects in Magellanic Clouds (Bica+, 2008)
J/AJ/136/1703 : Ridgelines of six intermediate-age SMC clusters (Glatt+, 2008)
J/AJ/138/517 : CaII spectroscopy of SMC red giants (Parisi+, 2009)
J/A+A/554/A33 : VMC Survey. VII. 30 Doradus reddening map (Tatton+, 2013)
J/MNRAS/442/1680 : Red giants in SMC. Abundances (Dobbie+, 2014)
J/ApJ/780/59 : Araucaria project: eclipsing binaries in SMC (Graczyk+, 2014)
J/ApJ/795/108 : Stellar populations in the Magellanic bridge (Skowron+, 2014)
J/A+A/591/A11 : SMC BV photometry of 9 star cluster fields (Dias+, 2016)
J/AJ/151/144 : ASPCAP weights for APOGEE chemical elements (Garcia+, 2016)
J/ApJ/832/176 : Classical Cepheids in MCs. I. LMC disk (Inno+, 2016)
J/AJ/152/58 : CaII spectroscopy of SMC red giants. IV. (Parisi+, 2016)
J/AcA/66/131 : VI light curves of SMC and LMC RR Lyrae (Soszynski+, 2016)
J/A+A/605/A89 : Abund. of microlensed Bulge dwarf stars. VI. (Bensby+, 2017)
J/AJ/154/199 : Survey of the MAgellanic Stellar History (Nidever+, 2017)
J/AcA/67/363 : New star clusters in the Magellanic system (Sitek+, 2017)
J/ApJ/860/1 : Radial velocity measurements of 20 EBs in LMC (Graczyk+, 2018)
J/A+A/628/A51 : Magellanic Clouds reddening map (Joshi+, 2019)
http://ogle.astrouw.edu.pl/cgi-ogle/get_ms_ext.py : E(V-I) Reddening Map in
Magellanic System from OGLE-IV Red Clump stars
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 F4.1 arcmin Box [3.4/27.5] Box size
6- 14 F9.6 h RAh [-0.03/6.74] Right Ascension
in decimal hour (J2000)
16- 25 F10.6 deg DEdeg [-77.53/-60.62] Declination
in decimal degrees (J2000)
27- 31 F5.3 mag E(V-I) [0/0.7] Median (V-I) color excess
33- 37 F5.3 mag e_E(V-I) [0.015/0.5] Lower 34% sigma uncertainty
39- 43 F5.3 mag E_E(V-I) [0.014/0.6] Upper 34% sigma uncertainty
45- 49 F5.3 mag (V-I)RC [0.8/1.6] Red clump (V-I) color index
51- 55 F5.3 mag (V-I)0 [0.8/0.9] Intrinsic (V-I) color index
57- 61 F5.3 mag E(V-I)p [0/0.76] Peak (V-I) color excess
63- 68 F6.3 mag E(V-I)SFD [0.02/36.3] E(V-I) based on dust infrared
emission
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 23-Apr-2021